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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71665fd5cb336f23597a58fdc1419d30447665fb7381453008ec8ce0abb8c1ea' 
  AND token = '6wISTq8B7YAgzwcLjaiQtIantll8AY84lw36u6dNc5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}